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[two_dimensional_scrollables] Unexpected null value on collapse of the last TreeView node #164981

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flutter/packages
#11622
Closed
[two_dimensional_scrollables] Unexpected null value on collapse of the last TreeView node#164981
flutter/packages
#11622
Assignees
Piinks
Labels
P2Important issues not at the top of the work listfound in release: 3.29Found to occur in 3.29found in release: 3.30Found to occur in 3.30has reproducible stepsThe issue has been confirmed reproducible and is ready to work onp: two_dimensional_scrollablesIssues pertaining to the two_dimensional_scrollables packagepackageflutter/packages repository. See also p: labels.team-frameworkOwned by Framework teamtriaged-frameworkTriaged by Framework teamwaiting for PR to land (fixed)A fix is in flight

Description

@sashkent3
sashkent3
opened on Mar 11, 2025

What package does this bug report belong to?

two_dimensional_scrollables

What target platforms are you seeing this bug on?

Linux, Web

Have you already upgraded your packages?

Yes

Dependency versions

pubspec.lock 
# Generated by pub
# See https://dart.dev/tools/pub/glossary#lockfile
packages:
  async:
    dependency: transitive
    description:
      name: async
      sha256: d2872f9c19731c2e5f10444b14686eb7cc85c76274bd6c16e1816bff9a3bab63
      url: "https://pub.dev"
    source: hosted
    version: "2.12.0"
  boolean_selector:
    dependency: transitive
    description:
      name: boolean_selector
      sha256: "8aab1771e1243a5063b8b0ff68042d67334e3feab9e95b9490f9a6ebf73b42ea"
      url: "https://pub.dev"
    source: hosted
    version: "2.1.2"
  characters:
    dependency: transitive
    description:
      name: characters
      sha256: f71061c654a3380576a52b451dd5532377954cf9dbd272a78fc8479606670803
      url: "https://pub.dev"
    source: hosted
    version: "1.4.0"
  clock:
    dependency: transitive
    description:
      name: clock
      sha256: fddb70d9b5277016c77a80201021d40a2247104d9f4aa7bab7157b7e3f05b84b
      url: "https://pub.dev"
    source: hosted
    version: "1.1.2"
  collection:
    dependency: transitive
    description:
      name: collection
      sha256: "2f5709ae4d3d59dd8f7cd309b4e023046b57d8a6c82130785d2b0e5868084e76"
      url: "https://pub.dev"
    source: hosted
    version: "1.19.1"
  fake_async:
    dependency: transitive
    description:
      name: fake_async
      sha256: "6a95e56b2449df2273fd8c45a662d6947ce1ebb7aafe80e550a3f68297f3cacc"
      url: "https://pub.dev"
    source: hosted
    version: "1.3.2"
  flutter:
    dependency: "direct main"
    description: flutter
    source: sdk
    version: "0.0.0"
  flutter_test:
    dependency: "direct dev"
    description: flutter
    source: sdk
    version: "0.0.0"
  leak_tracker:
    dependency: transitive
    description:
      name: leak_tracker
      sha256: c35baad643ba394b40aac41080300150a4f08fd0fd6a10378f8f7c6bc161acec
      url: "https://pub.dev"
    source: hosted
    version: "10.0.8"
  leak_tracker_flutter_testing:
    dependency: transitive
    description:
      name: leak_tracker_flutter_testing
      sha256: f8b613e7e6a13ec79cfdc0e97638fddb3ab848452eff057653abd3edba760573
      url: "https://pub.dev"
    source: hosted
    version: "3.0.9"
  leak_tracker_testing:
    dependency: transitive
    description:
      name: leak_tracker_testing
      sha256: "6ba465d5d76e67ddf503e1161d1f4a6bc42306f9d66ca1e8f079a47290fb06d3"
      url: "https://pub.dev"
    source: hosted
    version: "3.0.1"
  matcher:
    dependency: transitive
    description:
      name: matcher
      sha256: dc58c723c3c24bf8d3e2d3ad3f2f9d7bd9cf43ec6feaa64181775e60190153f2
      url: "https://pub.dev"
    source: hosted
    version: "0.12.17"
  material_color_utilities:
    dependency: transitive
    description:
      name: material_color_utilities
      sha256: f7142bb1154231d7ea5f96bc7bde4bda2a0945d2806bb11670e30b850d56bdec
      url: "https://pub.dev"
    source: hosted
    version: "0.11.1"
  meta:
    dependency: transitive
    description:
      name: meta
      sha256: e3641ec5d63ebf0d9b41bd43201a66e3fc79a65db5f61fc181f04cd27aab950c
      url: "https://pub.dev"
    source: hosted
    version: "1.16.0"
  path:
    dependency: transitive
    description:
      name: path
      sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"
      url: "https://pub.dev"
    source: hosted
    version: "1.9.1"
  sky_engine:
    dependency: transitive
    description: flutter
    source: sdk
    version: "0.0.0"
  source_span:
    dependency: transitive
    description:
      name: source_span
      sha256: "254ee5351d6cb365c859e20ee823c3bb479bf4a293c22d17a9f1bf144ce86f7c"
      url: "https://pub.dev"
    source: hosted
    version: "1.10.1"
  stack_trace:
    dependency: transitive
    description:
      name: stack_trace
      sha256: "8b27215b45d22309b5cddda1aa2b19bdfec9df0e765f2de506401c071d38d1b1"
      url: "https://pub.dev"
    source: hosted
    version: "1.12.1"
  stream_channel:
    dependency: transitive
    description:
      name: stream_channel
      sha256: "969e04c80b8bcdf826f8f16579c7b14d780458bd97f56d107d3950fdbeef059d"
      url: "https://pub.dev"
    source: hosted
    version: "2.1.4"
  string_scanner:
    dependency: transitive
    description:
      name: string_scanner
      sha256: "921cd31725b72fe181906c6a94d987c78e3b98c2e205b397ea399d4054872b43"
      url: "https://pub.dev"
    source: hosted
    version: "1.4.1"
  term_glyph:
    dependency: transitive
    description:
      name: term_glyph
      sha256: "7f554798625ea768a7518313e58f83891c7f5024f88e46e7182a4558850a4b8e"
      url: "https://pub.dev"
    source: hosted
    version: "1.2.2"
  test_api:
    dependency: transitive
    description:
      name: test_api
      sha256: fb31f383e2ee25fbbfe06b40fe21e1e458d14080e3c67e7ba0acfde4df4e0bbd
      url: "https://pub.dev"
    source: hosted
    version: "0.7.4"
  two_dimensional_scrollables:
    dependency: "direct main"
    description:
      name: two_dimensional_scrollables
      sha256: b6028c80e782e58a5d18f9491737aae4f70d72dc08050ac92006905c7c0b5e21
      url: "https://pub.dev"
    source: hosted
    version: "0.3.3"
  vector_math:
    dependency: transitive
    description:
      name: vector_math
      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
      url: "https://pub.dev"
    source: hosted
    version: "2.1.4"
  vm_service:
    dependency: transitive
    description:
      name: vm_service
      sha256: "0968250880a6c5fe7edc067ed0a13d4bae1577fe2771dcf3010d52c4a9d3ca14"
      url: "https://pub.dev"
    source: hosted
    version: "14.3.1"
sdks:
  dart: ">=3.7.0-0 <4.0.0"
  flutter: ">=3.22.0"

Steps to reproduce

  1. Launch the two_dimentional_scrollables official example.
  2. Press TreeView Explorer.
  3. Choose Custom.
  4. Expand test/tree_view.
  5. Resize the app vertically such that the TreeView becomes scrollable.
  6. Scroll to the bottom but keep the root test entry visible.
  7. Collapse the root test entry.

Expected results

There shouldn't be an error.

Actual results

There's an Unexpected null value error, see the Logs section below.

Code sample

Code sample https://github.com/flutter/packages/tree/c392bfe5bfb37bc89d059363e6c12c24d436373c/packages/two_dimensional_scrollables/example

Screenshots or Videos

Logs

Logs 
>>> flutter --verbose run -d chrome
[  +27 ms] executing: uname -m
[   +9 ms] Exit code 0 from: uname -m
[        ] x86_64
[  +66 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] Artifact Instance of 'LegacyCanvasKitRemover' is not required, skipping update.
[   +1 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +53 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[   +2 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +49 ms] Skipping pub get: version match.
[ +100 ms] Generating /home/sasha/Downloads/flutter packages main
packages-two_dimensional_scrollables_example/android/app/src/main/java/io/flutter/plugins/GeneratedPlugi
nRegistrant.java
[ +102 ms] Launching lib/main.dart on Chrome in debug mode...
[  +80 ms] Initializing file store
[   +6 ms] Skipping target: gen_localizations
[   +2 ms] Skipping target: gen_dart_plugin_registrant
[        ] Skipping target: _composite
[   +1 ms] complete
[   +1 ms] Updating assets
[  +80 ms] Waiting for connection from debug service on Chrome...
[  +38 ms] shaderc command: [/opt/flutter/bin/cache/artifacts/engine/linux-x64/impellerc, --sksl,
--iplr, --json, --sl=build/flutter_assets/shaders/ink_sparkle.frag,
--spirv=build/flutter_assets/shaders/ink_sparkle.frag.spirv,
--input=/opt/flutter/packages/flutter/lib/src/material/shaders/ink_sparkle.frag, --input-type=frag,
--include=/opt/flutter/packages/flutter/lib/src/material/shaders,
--include=/opt/flutter/bin/cache/artifacts/engine/linux-x64/shader_lib]
[ +177 ms] <- reset
[   +3 ms] /opt/flutter/bin/cache/dart-sdk/bin/dartaotruntime
/opt/flutter/bin/cache/dart-sdk/bin/snapshots/frontend_server_aot.dart.snapshot --sdk-root
/opt/flutter/bin/cache/flutter_web_sdk/ --incremental --target=dartdevc
--experimental-emit-debug-metadata --output-dill /tmp/flutter_tools.IZYQTT/flutter_tool.JUBCIE/app.dill
--packages /home/sasha/Downloads/flutter packages main
packages-two_dimensional_scrollables_example/.dart_tool/package_config.json -Ddart.vm.profile=false
-Ddart.vm.product=false --enable-asserts --track-widget-creation --filesystem-root
/tmp/flutter_tools.IZYQTT/flutter_tools.FOIABC --filesystem-scheme org-dartlang-app
--initialize-from-dill build/80b1a4cf4e7b90e1ab5f72022a0bc624.cache.dill.track.dill --platform
file:///opt/flutter/bin/cache/flutter_web_sdk/kernel/ddc_outline_sound.dill --verbosity=error
--sound-null-safety
[   +9 ms] <- compile org-dartlang-app:/web_entrypoint.dart
[+13352 ms] Waiting for connection from debug service on Chrome... (completed in 13.6s)
[        ] Synced 46.8MB.
[        ] <- accept
[        ] Caching compiled dill
[  +45 ms] Launching Chromium (url = http://localhost:38901, headless = false, skipCheck = false,
debugPort = null)
[        ] Will use Chromium executable at /bin/chromium
[  +39 ms] Using Chromium 134.0.6998.35 Arch Linux

[   +1 ms] executing: uname -m
[   +6 ms] Exit code 0 from: uname -m
[        ] x86_64
[ +202 ms] [CHROME]: 
[   +1 ms] [CHROME]: DevTools listening on
ws://127.0.0.1:35943/devtools/browser/4e435c35-c418-4e66-9b6d-43295c412f9c
[ +314 ms] DwdsInjector: Received request for entrypoint at
http://localhost:38901/main_module.bootstrap.js
[   +2 ms] MetadataProvider: Loading debug metadata...
[   +2 ms] MetadataProvider: Loaded debug metadata for module: web_entrypoint.dart
[        ] MetadataProvider: Loaded debug metadata for module: web_plugin_registrant.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/two_dimensional_examples/main.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/two_dimensional_examples/tree_view/tree_explorer.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/two_dimensional_examples/tree_view/simple_tree.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/two_dimensional_scrollables/two_dimensional_scrollables.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/two_dimensional_scrollables/src/tree_view/tree_span.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/two_dimensional_scrollables/src/common/span.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/cupertino/text_form_field_row.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/painting.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/painting/placeholder_span.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/painting/text_scaler.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/foundation.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/unicode.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/timeline.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/constants.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/_timeline_web.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/meta/meta.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/meta/meta_meta.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/synchronous_future.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/stack_frame.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/object.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/service_extensions.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/serialization.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/print.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/_platform_web.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/basic_types.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/persistent_hash_map.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/observer_list.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/foundation/node.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/memory_allocations.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/licenses.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/foundation/key.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/_isolates_web.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/consolidate_response.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/collections.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/change_notifier.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/capabilities.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/_capabilities_web.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/_bitfield_web.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/binding.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/foundation/annotations.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/undo_manager.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/text_layout_metrics.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/text_editing.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/text_editing_delta.dart
[   +1 ms] MetadataProvider: Loaded debug metadata for module: packages/vector_math/vector_math_64.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/scheduler.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/scheduler/ticker.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/scheduler/binding.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/scheduler/priority.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/scheduler/service_extensions.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/scheduler/debug.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/collection.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/wrappers.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/collection/src/union_set_controller.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/union_set.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/queue_list.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/collection/src/priority_queue.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/utils.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/collection/src/list_extensions.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/equality.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/comparators.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/algorithms.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/iterable_zip.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/collection/src/iterable_extensions.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/functions.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/equality_set.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/equality_map.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/collection/src/combined_wrappers/combined_map.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/collection/src/combined_wrappers/combined_iterable.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/collection/src/combined_wrappers/combined_iterator.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/collection/src/combined_wrappers/combined_list.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/collection/src/canonicalized_map.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/collection/src/boollist.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/keyboard_key.g.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/keyboard_maps.g.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/binary_messenger.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/service_extensions.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/keyboard_inserted_content.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/text_formatter.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/characters/characters.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/characters/src/extensions.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/characters/src/characters_impl.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/characters/src/grapheme_clusters/table.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/characters/src/grapheme_clusters/constants.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/characters/src/grapheme_clusters/breaks.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/text_boundary.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/system_sound.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/system_navigator.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/spell_check.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/services/scribe.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/process_text.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/predictive_back_event.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/services/platform_views.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/gestures.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/gestures/velocity_tracker.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/gestures/lsq_solver.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/gestures/events.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/gestures/gesture_settings.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/gestures/constants.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/gestures/binding.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/gestures/pointer_signal_resolver.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/gestures/pointer_router.dart
[   +1 ms] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/gestures/hit_test.dart
[   +1 ms] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/gestures/arena.dart
[        ] MetadataProvider: Loaded debug metadata for module: packages/flutter/src/gestures/debug.dart
[        ] MetadataProvider: Loaded debug metadata for module:
packages/flutter/src/gestures/resampler.dart
[        ] MetadataProvider: Loaded debug metadata for module:
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[   +6 ms] DwdsInjector: Injected debugging metadata for entrypoint at
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[+2620 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js
[  +68 ms] ChromeProxyService: Caching package:flutter/src/widgets/widget_inspector.dart in expression
compiler worker
[  +94 ms] DevHandler: Debug service listening on ws://127.0.0.1:41751/waKQPIljN28=/ws

[  +10 ms] DevHandler: VmService proxy responded with an error:
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[   +6 ms] This app is linked to the debug service: ws://127.0.0.1:41751/waKQPIljN28=/ws
[   +1 ms] DevHandler: VmService proxy responded with an error:
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[   +8 ms] DevHandler: VmService proxy responded with an error:
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[   +3 ms] DevHandler: VmService proxy responded with an error:
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[   +3 ms] Debug service listening on ws://127.0.0.1:41751/waKQPIljN28=/ws
[   +2 ms] 🔥  To hot restart changes while running, press "r" or "R".
[        ] For a more detailed help message, press "h". To quit, press "q".
[        ] A Dart VM Service on Chrome is available at: http://127.0.0.1:41751/waKQPIljN28=
[ +103 ms] ExpressionEvaluator: Evaluating "() { return true; }" at
packages/flutter/src/cupertino/text_form_field_row.dart
[  +29 ms] ExpressionEvaluator: Evaluating JS: "function () {
             try {
               return ((() => {var output = function() {
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                   const dart_rti = dart_sdk.dart_rti;
                   const dart = dart_sdk.dart;
                   return dart.fn(() => true, dart_rti._Universe.eval(dart_rti._theUniverse(),
                   "core|bool()", true));
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[   +3 ms] ExpressionEvaluator: Evaluated "() { return true; }" to "{type: boolean, value: true}"
[ +464 ms] The Flutter DevTools debugger and profiler on Chrome is available at:
                    http://127.0.0.1:9102?uri=http://127.0.0.1:41751/waKQPIljN28=
[+17003 ms] ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY
╞═════════════════════════════════════════════════════════
[   +1 ms] The following TypeErrorImpl was thrown during paint():
[        ] Unexpected null value.
[        ] The relevant error-causing widget was:
[        ]   TreeViewport
[        ] 
TreeViewport:file:///home/sasha/.pub-cache/hosted/pub.dev/two_dimensional_scrollables-0.3.3/lib/src/tr
             ee_view/tree.dart:1002:12
[        ] When the exception was thrown, this was the stack:
[        ] dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 307:3     throw_
[        ] dart-sdk/lib/_internal/js_dev_runtime/private/profile.dart 117:39               nullCheck
[        ] packages/two_dimensional_scrollables/src/tree_view/render_tree.dart 594:8       [_paintRows]
[        ] packages/two_dimensional_scrollables/src/tree_view/render_tree.dart 434:9       paint
[        ] packages/flutter/src/rendering/object.dart 3371:7
[_paintWithContext]
[        ] packages/flutter/src/rendering/object.dart 175:10
_repaintCompositedChild
[        ] packages/flutter/src/rendering/object.dart 120:5
repaintCompositedChild
[        ] packages/flutter/src/rendering/object.dart 1251:31                              flushPaint
[        ] packages/flutter/src/rendering/object.dart 1261:14                              flushPaint
[        ] packages/flutter/src/rendering/binding.dart 618:5                               drawFrame
[        ] packages/flutter/src/widgets/binding.dart 1231:13                               drawFrame
[        ] packages/flutter/src/rendering/binding.dart 482:5
           [_handlePersistentFrameCallback]
[        ] packages/flutter/src/scheduler/binding.dart 1442:7
[_invokeFrameCallback]
[        ] packages/flutter/src/scheduler/binding.dart 1355:9
handleDrawFrame
[        ] packages/flutter/src/scheduler/binding.dart 1208:5
[_handleDrawFrame]
[        ] lib/_engine/engine/platform_dispatcher.dart 1347:5                              invoke
[        ] lib/_engine/engine/platform_dispatcher.dart 301:5
invokeOnDrawFrame
[        ] lib/_engine/engine/initialization.dart 190:36                                   <fn>
[        ] dart-sdk/lib/_internal/js_dev_runtime/patch/js_allow_interop_patch.dart 224:27
_callDartFunctionFast1
[        ] The following RenderObject was being processed when the exception was fired:
RenderTreeViewport#e4ea3:
[        ]   needs compositing
[        ]   creator: TreeViewport ← IgnorePointer-[GlobalKey#01efb] ← Semantics ← Listener ←
_GestureSemantics ←
[        ]     RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#b8442] ← Listener ←
_ScrollableScope
[        ]     ← _ScrollSemantics-[GlobalKey#8cf05] ← NotificationListener<ScrollMetricsNotification> ←
[        ]     _HorizontalInnerDimension-[LabeledGlobalKey<ScrollableState>#a5241] ←
[        ]     IgnorePointer-[GlobalKey#2f62d] ← ⋯
[        ]   parentData: <none> (can use size)
[        ]   constraints: BoxConstraints(w=458.6, h=342.0)
[        ]   layer: OffsetLayer#a1649
[        ]   size: Size(458.6, 342.0)
[        ] This RenderObject had the following descendants (showing up to depth 5):
[        ]     (row: 5, depth: 0): RenderRepaintBoundary#956e5 relayoutBoundary=up1
[        ]       child: RenderFlex#f440c relayoutBoundary=up2
[        ]         child 1: RenderConstrainedBox#d2242 relayoutBoundary=up3
[        ]         child 2: RenderDecoratedBox#57229 relayoutBoundary=up3
[        ]           child: RenderConstrainedBox#ed20a relayoutBoundary=up4
[        ]         child 3: RenderDecoratedBox#9dace relayoutBoundary=up3
[        ]           child: RenderConstrainedBox#6bdb6 relayoutBoundary=up4
[        ]             child: RenderSemanticsAnnotations#cce9f
[        ]         child 4: RenderConstrainedBox#5b3b6 relayoutBoundary=up3
[        ]         child 5: RenderParagraph#74e7d relayoutBoundary=up3
[        ]           text: TextSpan
[        ]     (row: 4, depth: 0): RenderRepaintBoundary#c9201 relayoutBoundary=up1
[        ]       child: RenderFlex#b36ed relayoutBoundary=up2
[        ]         child 1: RenderConstrainedBox#9374d relayoutBoundary=up3
[        ]         child 2: RenderDecoratedBox#d19e8 relayoutBoundary=up3
[        ]           child: RenderConstrainedBox#5b258 relayoutBoundary=up4
[        ]         child 3: RenderConstrainedBox#e4a27 relayoutBoundary=up3
[        ]         child 4: RenderParagraph#e09b6 relayoutBoundary=up3
[        ]           text: TextSpan
[        ]
════════════════════════════════════════════════════════════════════════════════════════════════════
[+9064 ms] Shutting down Chromium.
[  +15 ms] ChromeProxyService: Destroying isolate
[        ] BatchedExpressionEvaluator: Closed
[   +2 ms] ChromeProxyService: Destroying isolate
[   +1 ms] DevHandler: Stopped debug service on ws://127.0.0.1:43373

[   +1 ms] Failed to clean up temp directory: /tmp/flutter_tools.IZYQTT/flutter_tools.FOIABC
[        ] Application finished.
[   +2 ms] "flutter run" took 44,302ms.
[        ] Running 3 shutdown hooks
[        ] Shutdown hooks complete
[   +4 ms] exiting with code 0

Flutter Doctor output

Doctor output 
flutter doctor -v
[✓] Flutter (Channel stable, 3.29.1, on Arch Linux 6.13.5-arch1-1, locale en_US.UTF-8) [50ms]
    • Flutter version 3.29.1 on channel stable at /opt/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 09de023485 (11 days ago), 2025-02-28 13:44:05 -0800
    • Engine revision 871f65ac1b
    • Dart version 3.7.0
    • DevTools version 2.42.2

[!] Android toolchain - develop for Android devices [38ms]
    • Android SDK at /opt/android-sdk
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/to/linux-android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.

    • ANDROID_HOME = /opt/android-sdk
    • ANDROID_SDK_ROOT = /opt/android-sdk
    ✗ No valid Android SDK platforms found in /opt/android-sdk/platforms. Candidates were:
        - android-35
    • Try re-installing or updating your Android SDK,
      visit https://flutter.dev/to/linux-android-setup for detailed instructions.

[✓] Chrome - develop for the web [18ms]
    • CHROME_EXECUTABLE = /bin/chromium

[✓] Linux toolchain - develop for Linux desktop [141ms]
    • clang version 19.1.7
    • cmake version 3.31.6
    • ninja version 1.12.1
    • pkg-config version 2.3.0

[!] Android Studio (not installed) [16ms]
    • Android Studio not found; download from https://developer.android.com/studio/index.html
      (or visit https://flutter.dev/to/linux-android-setup for detailed instructions).

[✓] Connected device (2 available) [118ms]
    • Linux (desktop) • linux  • linux-x64      • Arch Linux 6.13.5-arch1-1
    • Chrome (web)    • chrome • web-javascript • Chromium 134.0.6998.35 Arch Linux

[✓] Network resources [347ms]
    • All expected network resources are available.

! Doctor found issues in 2 categories.

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P2Important issues not at the top of the work listfound in release: 3.29Found to occur in 3.29found in release: 3.30Found to occur in 3.30has reproducible stepsThe issue has been confirmed reproducible and is ready to work onp: two_dimensional_scrollablesIssues pertaining to the two_dimensional_scrollables packagepackageflutter/packages repository. See also p: labels.team-frameworkOwned by Framework teamtriaged-frameworkTriaged by Framework teamwaiting for PR to land (fixed)A fix is in flight

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